Pilot-burner.



P. D. JOHNSON.

PILOT BURNER.

APPLICATION FILED SEPT- 20. 1916.

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P. D. JOHNSON.

PILOT BURNER APPLICATION FILED SEPT-20,19|6' 1,225,719, Patented May 8, 1917-.

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PILOT BURNER.

APPLICATION FILED SEPT-20. i916.

Patented May 8, 1917.

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UNITED TATE PATENT @FFTQE.

PHILIP D. JOHNSON, OF CHICAGO, ILLINQIS, ASSIGNOB F ONE-HALF TO CHARLES A.

' BROWN, 0F IEINSDALE, ILLINOIS.

PILOTBUR1\TER.

Specification of Letters Patent.

lPatented May 8, 1917.

Application filed. September 20, 1916. Serial No. 121,295.

To all whom it may concern:

Be it known that 1:, Purnrr D. Jouusor, a citizen of the United States. residing at Chicago, in the county 01" Cook and State of Illinois, have invented a certain new and useful Improvement in Pilot Burners, of which the following is a full clear, concise, and exact description, referencebeing had to the accompanying drawings, forming a part of this specification.

My invention provides an improved pilot burner particularly for use in connection with the main burner shown in my co-pending application, Serial No. 83704, filed March 13th, 1916, although I do not intend to limit the present invention to such use.

Pilot burners due to the continuous use to which they are subjected, and particularly when used in connection with heavier grades of fuel oil are subject to clogging. This clogging is caused by the carbonization of the oil and also by the formation of a thick, heavy distillate.

The object of the invention is to simplify and cheapen the construction of a pilot burner. To this end I construct the vaporizer of the burner with a return bend pas sage formed by two tubes which communicate at the inner end of the vaporizer and both of which are accessible for cleaning by the removal of a single screw. The joining block between the vaporizer and the nozzle is made of a particular form to aid in maintaining the vapor in a highly heated condition and to cooperate witi-the main vaporizer in securing an efficient application of heat to these parts.

In the accompanying drawings Figure 1 is a fragmentary cross-sectional 1 elevation of the main burner, showing the pilot burner and vaporizer in place;

Fig. 2 is a front elevation of the'main and pilot burner with the cap of the housing removed;

Fig. 3 is a side elevation of the pilot vaporizer;

Fig. is a cross-sectional'view of a modified form of the pilot vaporizer;

Fig. 5 is a perspective view of the vapor izer shown in Fig. 4: and the cap of the housing which covers it;

Fig. 6 is a fragmentary plan. view of the burner for the pilot light; and

Fig. 7 is an end view of the burner for the pilot light.

As the pilot burner of thepresentinvention is particularly adapted for use in connection with the main burner described in the above mentioned application, I have illustrated the same in connection with said main burner. The main burner comprises a burner casting 1 which is provided with the usual ridges or serrations having slots for discharging the mixture of oil vapor and air. A suitable shell or casing 2 which may be formed largely of sheet metal incloses the burner casting 1 and provides a suitable support for the housing 3 at the front. This housing comprises a hollow base portion 4; and cap or top portion 5 secured to the base portion by suitable screws 6. The main burner is provided with a pair of induction tubes 7, only one of which is shown in Fig. 1. and the main vaporizer nozzles 8 and 9 deliver fuel vapor in the form of a jet to said induction tubes. The main nozzles 8 and 9 are connected by means of the blocks 10 and 11 to the corresponding vaporizing tubes12 which extend in pairs over the main burner 1 all as is fully described and claimed in the above mentioned application. Each main nozzle has a passage communicating with the lower tube 12 and the upper tube 12 communicates by means of the connecting blocks 16 or 17. as the case may be, with the corresponding fuel supply pipes 14 or 15. as the case maybe. i

The pilot is provided with burner casting 18 which lies in the central groove oetween the ridges of the main burner casting 1 and is adapted in operation to condition the main burner vaporizer for immediate use. The pilot burner casting 18, as is shown in 'Fig. 6, is provided with a pair of wings 19 and 20 which project into the housing 3 and serve to maintain the parts in said housing'at a relatively high temperature. Laterally extending plate portions 21 and 22 which are suitably notched, as indicated, to receive the main burner nozzles, serve as closing means for the bottom of the housing space & which is otherwise open.

Projecting out from the pilot casting 18' is the pilot induction tube 23. The projecting end of this tube has its lower periphery cut and bent vertical to form side walls for directing the influx of air to the pilot burner. The side Walls by drawing mainly from the air beneath them, prevent any starvation of the pilot burner as might occur from a large draft of air to feed the main burner induction tubes.

The pilot' burner is placed between the vaporizers of the main burner. Vaporizer blocks 10 and 11 of the main vaporizer are secured to the top of the housing 4 as by means of the bolts or screws 24 and '25 which are adapted to hold the nozzles 8 and 9 in the notches in the plate portions 21 and 22 of the pilot burner in such positions that the nozzles are held in proper alinement with the induction tubes 7. As the vaporizing tubes 12 are brought closely together in the fire box in order to sub ect them to the heat from the pilot burner 18. it'will be seen that the nozzles 8 and 9 and the blocks 10 and 11 stand at an angle, as will be understood from Fig. 2. The pilot burner has a nozzle 26 provided with a removable tip 27 and a suitable controlling valve 28 for controlling the size of the pilot flame. The body of thenozzle 26 joins the connecting block 29 which has a communicating passage for establishing communication between the nozzle 26 and the lower vaporizing tube 30. The bore in the block 29 for supporting the upper vaporizing tube 31 is deeply recessed as is shown in Fig. 3 to decrease the surface contact between the tube 31 and block 29 so as to minimize the chilling effect upon the block 29 of the cold oil flowing into the tube 31. The block 29 has its sides tapered to fit snugly between the blocks 10 and 11 immediately above the wings 19 and 20 of the pilot burner. This block is therefore directly above the said portions of the pilot burner and is always maintained at a high temperature. The vaporizing blocks 10 and 11 are also maintained at a high temperature and no chilling of the fuel vapor occurs. The block 29 is supported in the housing portion 4 by means of a stud 32 which lies in the slot 33 formed in a lug 34 projecting from the upper edge of the cap 5. The upper vaporizing tube 31 is provided at its outermost end with a screw threaded portion 35 which is adapted to be connected as by means of the block 36 (see Fig. 1) to the oil supply pipe or main.

The two vaporizing tubes 31 and 30 of the pilot vaporizer are joined together at their inner ends by a suitable miter joint. The tubes are cut off at an angle such that the lower tube 30 may be threaded into the block 29 and the upper tube 31 projects through the aperture in the block 29, as is shown in Fig. 3. The corner of the miter joint is cut off in order to form a suitable cleaning opening for both of the tubes. The joint is closed by brazing or welding, as is shown at 37 in Fig. 3, the tubes being held together in suitable position during this operation by means of wires 38. The

cleaning opening at the end of the joint is closed by means of a suitable screw 39 and a copper washer or the like, 40.

It can now be seen that every part of the vaporizer for the pilot burner is accessible for cleaning in a very simple and convenient manner. A cleaning screw 41 opens into the lower end of the nozzle 26 and provides an opening for cleaning out the nozzle 26 and the passageway in the block 29. The cleaning screw 39 permits a cleaning wire or similar implement to be introduced into the bore of the tube 30 as well as into the bore of the tube 31 from the same opening. The tip 27 of the nozzle 26.is removable and the stem of the'needle valve 28 is also removable. At the same time it can be seen that the vaporizer and nozzle are typified by great simplicity of construction and low cost of manufacture. The construction is so inexpensive that no great loss will be incurred even if the vaporizing tubes 30 and 31 should become completely clogged and would have to be thrown away.

It will be noticed that the extension 35 of the pipe 31 projects out through the opening 42 in the front of the cap 5. This opening is surrounded by a flange 43 which provides a suitable seat for the swinging cover 44 which is hung upon the pipe 35 as may be seen from Fig. 1 and normally closes the opening 42 in the front of the cap 5.

Thus, in order to gain access to the cleaning opening in the pilot vaporizer, it is necessary only to remove the screws 6 which hold the cap 5 upon the base portion 4. If it is further desired to detach the vaporizer completely from the supporting cap 5, the stud 32 is released by unscrewing the nut 45 and the supply pipe is disconnected at the connecting block 36, leaving the va-- porizer free of the other connected parts. The base 4 of the housing is provided with an integral tongue 46 which projects out over the burner 18 and aids in keeping the base 4 and connected parts in a heated con dition so that there will be no chilling of the vapor, either in the main Vaporizers or in the pilot vaporizer.

In Fig. 4 I have shown a modification in which the two return pipes of the pilot vaporizer are substantially concentric with each other. A connecting block 29 similar to the block 29, shown in Figs. 1, 2 and 3, has a connecting passage 48 for connecting the nozzle 26 with the outer tube 47. The tube 47 is threaded into an opening in the block 29 on one side of the passage 48 through said block and a short length of pipe 35 is threaded in the opposite side of the block in line with the tube 47. A tube of small diameter 49 is connected to the short piece of pipe 35 and projects into the bore of the outer tube 47 to a point adjacent the inner end of said pipe 47. The inner end of the tube at? is closed by a screw 39 and it is apparent that by withdrawing said screw, the passages in both of the tubes 47 and l9 are exposed for cleaning. The block 29 is provided with a stud 32 which is adapted to be secured in the slot of the lug 34*, as is apparent from Fig. 5.

In both the modifications shown in Figs 1 to 3 and in Figs. I and 5, the vaporizing tubes are supported from the blocks 29 and 29, and due to the relatively short lengths are not subject to warping or bending. The valve 28 lies beneath the cap 5 and even if the stud 32 should become loosened to a considerable extent, tilting of the vaporizer would be prevented by the bearing of the valve 28 against the bottom of the cap 5.

I contemplate employing a screw 39 having a long head for insertion in a suitable yoke suspended between the tubes of the main vaporizer as is illustrated in the above mentioned application.

It can be seen from the above that I have provided a vaporizer for the pilot burner.

and a means for supporting the same characterized by simplicity, ease of cleaning and low cost of construction. The dimensions of the device have been reduced to a minimum without sacrificing any of the operating qualities.

' I claim:

1. In combination a housing comprising a base portion, and a cap portion, main vaporizer blocks secured to said base portion, said blocks diverging from each other, a pilot vaporizer block secured to the cap of said housing, said pilot vaporizer block being of substantially the same thickness as the main vaporizer blocks and being tapered to fill the space between said main vaporizing blocks, nozzles for said main vaporizing blocks and a nozzle for said pilot vaporizing block and a pilot burner having wings extending between the main vaporizing nozzles and the pilot nozzle and being adapted to heat said block and nozzle.

2. In combination a pilot burner, a nozzle for said burner, a. vaporizer for said burner, said vaporizer being connected to said nozzle, said vaporizer comprising a block having a passage therein and a pair of tubes, a

cleaning screw lying in line with the bore of each of said tubes and normally closing an opening permitting access to both of said tubes, both of said tubes being free to expand under the influence of heat, said tubes and said block being heated by said pilot burner.

3. In combination a housing comprising a base portion and a cap portion, main vaporizer blocks secured to said base portion, said blocks being inclined toward each other, a pilot vaporizer block secured to said cap portion, said block closely fitting between said main vaporizer blocks, a pilot burner having wings projecting below all of said blocks, a pilot vaporizer nozzle embraced by said burner wings and a pair of vaporizer tubes connected to said pilot vaporizer block, said tubes being supported by said block alone, and a single cleaning screw providing access to the bore of both vaporizing tubes.

4:. In combination, a housing comprising a base and cap, a pair of divergently related vaporizer blocks therein, a tapering pilot vaporizing block snugly arranged between first said blocks and having a duct, a pair of converging tubes communicating with each other at their free ends, one of said tubes communicating with the pilot block and the other tube passing through said block, and a pilot nozzle carried by the block.

5. In combination a pilot vaporizer block having a passage therein, a vaporizer tube secured to said block and communicating with said passage, a second vaporizer tube closely secured in said block, said vaporizing tubes being joined together at an angle and having a single cleaning screw permitting access to both of said tubes, said screw lying at the intersection of said tubes.

6. In combination, a housing comprising a base and a cap, a pair of divergently related vaporizing blocks within the housing, a tapering pilot vaporizing block arranged snugly between first said blocks and having a duct, a pair of vaporizer pipes, one communicating with the duct and the other passing through the block, a vaporizer nozzle carried by last said block and a valve to control said nozzle.

In witness whereof, I hereunto subscribe my name this 15th day of September, A. D.

PHILIP D. JOHNSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

